I am trying to register a new database from a federated server (the SQL Server machine) in ArcGIS Server Manager without luck. At the same time, I am not able to validate my existing data stores like the ArcGIS Data Store. I feel like these issues are related but I don't know where to start troubleshooting. SQL Server permissions? IIS?
I've tried both the web environment and the Data Store Manager in Pro. No luck.
In the browser, I am connecting to Server Manager on the AGS machine on local port 6443. ("myserver".local:6443/arcgis/manager/site.html)
Internet Explorer is not my default browser.
IIS Authentication on the AGS machine:


Thanks in advance!